Concrete-form holder



April 22, 1930. c. J. KoHLER CONCRETE FORM HOLDER Filed ,Dec l5 1927 INVENTOR. CAM-Form J. flf/[fl ATTORNEYS.

' Patented Apr. 22, 1930 PATENT FFEQE CLIFFORD J. KOI-ILER, (3F WAUWATOSA, WISCONSIN CONCRETE-BS3111 HGLDEIR Applicationfiled December 15, 1827. Serial No. 240,090.

My invention relates to an improvement in concrete form holders, such as are used in securing the placement of concrete walls,

. and it resides in an etficient and economical construction of great simplicity.

A unit of the invention comprises a pair of angle irons and a plurality of tie bars co-operating therewith. One flange of each angle iron is slitted transversely from its outer edge for approximately its full width, the slits being made at spaced points in the length of the angle irons, and are so located that they are aligned horizontally when the angle irons are positioned for use.

The tie bars are simple strips of comparatively thin metal, having a gauge about equal to the width of the slits in the flanges of the angle irons, so as to be readily inserted therein. The tie bars are provided near each 2 end with perforations in groups of two, the

groups being separated from each other a distance equal to the thickness of the wall to be poured, and the perforations of each group at the end of the tie bar being separated by a distance equal to the thickness of the form plus that of the flange of the angle iron.

In assembling the units for use. the angle irons of a pair are arranged vertically and the tie bars placed in the slits thereof. The forms are then positioned against the opposed flanges of the angle irons, and nails or pins are inserted in the perforations of the tie bars to hold the forms in close engagement with the flanges of the angle irons.

After the wall has been poured and set, with the tie bars embedded therein, the structure may be dismantled by simply pounding upon the angle irons so as to move them parallel with the wall, and free the slits in the angle irons from their engagement with the tie bars. The forms can then be removed by withdrawing the outermost nails in the tie bars, and the angle irons and the forms can be transported to another location.

Having thus outlined the nature of my in vention, I will now proceed to describe the same in detail, and will point out the novelty thereof in the appended claims.

In the accompanying drawing:

preparatory to the pouring of a concrete wall. a

Fig. 2 is a vertical transverse sectional .view through the structure illustrated in l" 1, taken in the plane of the edges of the slitted flanges of the angle irons.

Fig. 3 is a horizontal section on the line 33, Fig. 2, looking in the direction of the arrows.

Fig. 4.- is a perspective view of one of the tie bars.

1n the drawing, the numerals 10 and 11 indicate two angle irons of dimensions suitable for the work at hand. One flange of each angle iron is slitted transversely from its outer edge for the width of the flange, as at 12. The number of such slits 12, and their location will conform to the width of the boards 13 which are used as forms for defining the wall at the time it is poured. The distance between the slits in the flange of the angle bar should be about equal to the, width of the boards used as forms, to facilitate erection of the form holder.

The tie bars 14-, one of which is illustrated in Fig.4, arc flat metal strips of thin gauge, adapted for easy insertion in opposite horizontally aligned slits in the flanges of the angle irons. At each end, the tie bar is provided with a group of two perforations, the groups being separated a distance equal to the thickness of the wall to be poured, and the perforations of each group being separated a distance equal to the thickness of the form 13 and the flange of the angle iron.

In assembling the structure, two angle irons are held in position with their slitted flanges opposed, the angle irons being spaced apart a distance approximately that of the thickness of the wall. Two lower forms 13 are then placed against the opposed flanges of the angle irons, and a tie bar 14 is passed into the slits at the top of the forms 13. Nails or pins 15 are then driven partially into the inner perforations at the ends of the tie bar, so as to retain the forms in position and prevent their collapse. After this has been done,

similar. pins 16. are driven partially through V 3. A form holder for concrete walls comthe outer perforations in thetie bars, so as to tie the forms to-the angle irons and the side structures to eachother through the tie bars, which latter now actas spacing means. The units will be set up at suitable distances in the length of the wall. I I

r A second pair of forms 13 is new superposed in the vertical planes of the first, with the lower edges of such second forms resting upon the tie bars already inplace, and engaged by the nails or pins 15, to hold them against the angle irons. The nails or pins and 16 are now driven more tightly into the openings in the tie bars, so that a very accurate spacing of the forms is secured. A second tie bar 14 is now placed in the slits in the flanges of the angle irons at the top. of the second pair of forms, and the nails or pins 15 and 16 are applied as before. tion is repeated until a form of the desired height is erected. The length of the form will be coextensive with the wall, so that the forms against the angle iron.

pouring may be continuous.

The structure, assembled as described, is sufliciently stable to remain in place, but stays may be easily applied to correct any tendency to disalignment.

A valuable feature inhering in the invention resides in its simplicity and economical equipment, by means of which I avoid the use of the complicated structures now in the art. A suitable number of slitted angle irons 10 and 11, forms 13, tie bars 14, and a keg of nails comprise the equipment. These are easy to handle and require but little space for their transportation or. storage. The only parts to be removed are the angle irons and the forms.

When the wall has set, the structure may be quickly dismantled by simply knocking the angle bars longitudinally of the wall, so as to withdraw the slits in the flanges thereof from engagement with the tie bars, the tie bars passing freely out from the open-end slits.

The forms may then easily be removed, and the projecting ends of the tie bars sheared oft flush with the. surfaces of the wall.

Having thus described my invention,.what I claim and desire to secure by Letters Patent of the United States, is:

1. A form holder for'concrete walls comprising a pair of angle irons each having an open-endslit in one of its flanges, a tie bar inserted in the said slits, means co-operating with the tie bar to maintain the angle irons in spaced relation, and means for holding the :2. A form holder for concrete walls each of which is provided with open-end slits, tie bars inserted in the said'slits, and means co-operating, with the tie bars to hold the angle irons in spaced relation and the forms in engagement with the said angle irons.

This operacom prisinga pair of angle irons, one flange of prising a pair of angle irons, one flange of each of which is providedwith open-endslits spaced apart in the length of the angle iron,

a tie bar formed as a metallic strip entered in opposite slits in. the angle irons, the said tie bars being provided at their ends with perforations, for the reception ofnails or pins to maintain the angle irons in spaced relation and hold the forms in engagement withthe opposed angle irons. r

4. A form for molding concrete walls, comprising forms, a pair of angle irons, one flange of each of which is slitted from its outer edge, tie bars entered in the slits, and means co-opcrating with the tie bars to maintain the angle irons in spacedrelation and theforms in enga ement with the opposed angle irons.

o. A form for molding concrete walls, comprising forms, a pair of angle irons,- one flange of-each of which is slittedfromits outer edge, tie bars consisting of metallic strips entered in the said slits and interposed between the edges of the forms, and means co-operating with the tie bars to maintain the angle irons in spaced relation and the forms in engagement with the opposed angle irons of the pair.

In testimony whereof, I have signed my name at VVauwatosa, this 9th day of December,1927. M i, i r.

CLIFFORD J. KOHLER. 

